CodeIgniter通过hook的方式实现简单的权限控制

<?php
$config[‘enable_hooks‘] = TRUE;
?>

<?php
$hook[‘post_controller_constructor‘] = array(
    ‘class‘    => ‘Acl‘,  //控制类
    ‘function‘ => ‘filter‘,  //控制函数
    ‘filename‘ => ‘acl.php‘,  //控制文件
    ‘filepath‘ => ‘hooks‘  //存放路径
);
?>

<?php
//游客权限映射
$config[‘acl‘][‘visitor‘] = array(
    ‘‘ => array(‘index‘),//首页
//这里表示如一个visitor用户浏览/balance/create这样的额链接时是有权限的，但是浏览/balance/update就没有权限。
//如果需要则应该修改为‘balance‘=>array(‘create‘,‘update‘)
    ‘balance‘=>array(‘create‘)
);
//管理员
$config[‘acl‘][‘admin‘] = array(
 
);
//-------------配置权限不够的提示信息及跳转url------------------//
$config[‘acl_info‘][‘visitor‘] = array(
    ‘info‘ => ‘需要登录以继续‘,
    ‘return_url‘ => ‘user/login‘
);
 
$config[‘acl_info‘][‘more_role‘] = array(
    ‘info‘ => ‘需要更高权限以继续‘,
    ‘return_url‘ => ‘user/up‘
);
?>

<?php
class Acl
{
    private $url_model; //所访问的模块，如：music
    private $url_method;//所访问的方法，如：create
    private $url_param; //url所带参数 可能是 1 也可能是 id=1&name=test
    private $CI;
 
    function Acl()
    {
        $this->CI = & get_instance();
        $this->CI->load->library(‘session‘);
 
        $url = $_SERVER[‘PHP_SELF‘];
        $arr = explode(‘/‘, $url);
        $arr = array_slice($arr, array_search(‘index.php‘, $arr) + 1, count($arr));
        $this->url_model = isset($arr[0]) ? $arr[0] : ‘‘;
        $this->url_method = isset($arr[1]) ? $arr[1] : ‘index‘;
        $this->url_param = isset($arr[2]) ? $arr[2] : ‘‘;
    }
 
    function filter()
    {
        $user = $this->CI->session->userdata(‘user‘);
        if (empty($user)) {
        //游客visitor
            $role_name = ‘visitor‘;
        } else {
            $role_name = $user->role;
        }
 
        $this->CI->load->config(‘acl‘);
        $acl = $this->CI->config->item(‘acl‘);
        $role = $acl[$role_name];
        $acl_info = $this->CI->config->item(‘acl_info‘);
 
        if (array_key_exists($this->url_model, $role) && in_array($this->url_method, $role[$this->url_model])) {
            ;
        } else {//无权限，给出提示，跳转url
            $this->CI->session->set_flashdata(‘info‘, $acl_info[$role_name][‘info‘]);
            redirect($acl_info[$role_name][‘return_url‘]);
        }
    }
}
?>